US2428806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric photometer
Assignee: Individual
•
Filing: 1944-09-26
•
Granted: 1947-10-14
•
Expires: 1964-09-26
Abstract
No abstract record available.
Inventors
- 👤 Liben William
- 👤 Franklin H Mackenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:55
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE359854C
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US1560864A
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US1820219A
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US1864092A
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US1895853A
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GB389599A
Cited
US2269813A
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US2241743A
Cited
US2293425A
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US2406716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |